text: /*
   * Copyright 2011 Xamarin Inc
   */
  
  #ifndef __MONO_MINI_ARM_H__
  #define __MONO_MINI_ARM_H__
  
  #include <mono/arch/arm/arm-codegen.h>
  #include <mono/utils/mono-context.h>
  #include <glib.h>
  
  #ifdef __native_client_codegen__
  #define kNaClAlignmentARM 16
  #define kNaClAlignmentMaskARM (kNaClAlignmentARM - 1)
  #define kNaClLengthOfCallImm 4
  #endif
  
  #if defined(ARM_FPU_NONE)
  #define MONO_ARCH_SOFT_FLOAT_FALLBACK 1
  #endif
  
  #if defined(__ARM_EABI__)
  #if G_BYTE_ORDER == G_LITTLE_ENDIAN
  #define ARM_ARCHITECTURE "armel"
  #else
  #define ARM_ARCHITECTURE "armeb"
  #endif
  #else
  #define ARM_ARCHITECTURE "arm"
  #endif
  
  #if defined(ARM_FPU_VFP)
  #define ARM_FP_MODEL "vfp"
  #elif defined(ARM_FPU_NONE)
  #define ARM_FP_MODEL "vfp+fallback"
  #elif defined(ARM_FPU_VFP_HARD)
  #define ARM_FP_MODEL "vfp+hard"
  #else
  #error "At least one of ARM_FPU_NONE, ARM_FPU_VFP or ARM_FPU_VFP_HARD must be defined."
  #endif
  
  #define MONO_ARCH_ARCHITECTURE ARM_ARCHITECTURE "," ARM_FP_MODEL
  
  #define MONO_ARCH_CPU_SPEC mono_arm_cpu_desc
  
  #if G_BYTE_ORDER == G_LITTLE_ENDIAN
  #define ARM_LSW_REG ARMREG_R0
  #define ARM_MSW_REG ARMREG_R1
  #else
  #define ARM_LSW_REG ARMREG_R1
  #define ARM_MSW_REG ARMREG_R0
  #endif
  
  #define MONO_MAX_IREGS 16
  
  #define MONO_SAVED_GREGS 10 /* r4-r11, ip, lr */
  
  /* r4-r11, ip, lr: registers saved in the LMF  */
  #define MONO_ARM_REGSAVE_MASK 0x5ff0
  #define MONO_ARM_FIRST_SAVED_REG ARMREG_R4
  #define MONO_ARM_NUM_SAVED_REGS 10
  
  /* Parameters used by the register allocator */
  
  #define MONO_ARCH_CALLEE_REGS ((1<<ARMREG_R0) | (1<<ARMREG_R1) | (1<<ARMREG_R2) | (1<<ARMREG_R3) | (1<<ARMREG_IP))
  #define MONO_ARCH_CALLEE_SAVED_REGS ((1<<ARMREG_V1) | (1<<ARMREG_V2) | (1<<ARMREG_V3) | (1<<ARMREG_V4) | (1<<ARMREG_V5) | (1<<ARMREG_V6) | (1<<ARMREG_V7))
  
  /*
   * TODO: Make use of VFP v3 registers d16-d31.
   */
  
  /*
   * TODO: We can't use registers d8-d15 in hard float mode because the
   * register allocator doesn't allocate floating point registers globally.
   */
  
  #if defined(ARM_FPU_VFP_HARD)
  #define MONO_SAVED_FREGS 16
  #define MONO_MAX_FREGS 32
  
  /*
   * d8-d15 must be preserved across function calls. We use d14-d15 as
   * scratch registers in the JIT. The rest have no meaning tied to them.
   */
  #define MONO_ARCH_CALLEE_FREGS 0x00005555
  #define MONO_ARCH_CALLEE_SAVED_FREGS 0x55550000
  #else
  #define MONO_SAVED_FREGS 8
  #define MONO_MAX_FREGS 16
  
  /*
   * No registers need to be preserved across function calls. We use d0-d1
   * as scratch registers in the JIT. The rest have no meaning tied to them.
   */
  #define MONO_ARCH_CALLEE_FREGS 0x55555550
  #define MONO_ARCH_CALLEE_SAVED_FREGS 0x00000000
  #endif
  
  #define MONO_ARCH_USE_FPSTACK FALSE
  #define MONO_ARCH_FPSTACK_SIZE 0
  
  #define MONO_ARCH_INST_SREG2_MASK(ins) (0)
  
  #define MONO_ARCH_INST_FIXED_REG(desc) \
  	(mono_arch_is_soft_float () ? \
  	((desc) == 'l' || (desc) == 'f' || (desc) == 'g' ? ARM_LSW_REG : (desc) == 'a' ? ARMREG_R0 : -1) : \
  	((desc) == 'l' ? ARM_LSW_REG : (desc) == 'a' ? ARMREG_R0 : -1))
  
  #define MONO_ARCH_INST_IS_REGPAIR(desc) \
  	(mono_arch_is_soft_float () ? \
  	((desc) == 'l' || (desc) == 'L' || (desc) == 'f' || (desc) == 'g') : \
  	((desc) == 'l' || (desc) == 'L'))
  
  #define MONO_ARCH_INST_IS_FLOAT(desc) \
  	(mono_arch_is_soft_float () ? \
  	(FALSE) : \
  	((desc) == 'f' || (desc) == 'g'))
  
  #define MONO_ARCH_INST_REGPAIR_REG2(desc,hreg1) ((desc) == 'l' || (desc) == 'f' || (desc) == 'g' ? ARM_MSW_REG : -1)
  
  #define MONO_ARCH_FRAME_ALIGNMENT 8
  
  /* fixme: align to 16byte instead of 32byte (we align to 32byte to get 
   * reproduceable results for benchmarks */
  #define MONO_ARCH_CODE_ALIGNMENT 32
  
  /* This needs to hold both a 32 bit int and a 64 bit double */
  #define mono_unwind_reg_t guint64
  
  /* Argument marshallings for calls between gsharedvt and normal code */
  typedef enum {
  	GSHAREDVT_ARG_NONE = 0,
  	GSHAREDVT_ARG_BYVAL_TO_BYREF = 1,
  	GSHAREDVT_ARG_BYREF_TO_BYVAL = 2,
  	GSHAREDVT_ARG_BYREF_TO_BYVAL_I1 = 3,
  	GSHAREDVT_ARG_BYREF_TO_BYVAL_I2 = 4,
  	GSHAREDVT_ARG_BYREF_TO_BYVAL_U1 = 5,
  	GSHAREDVT_ARG_BYREF_TO_BYVAL_U2 = 6
  } GSharedVtArgMarshal;
  
  /* Return value marshalling for calls between gsharedvt and normal code */
  typedef enum {
  	GSHAREDVT_RET_NONE = 0,
  	GSHAREDVT_RET_IREG = 1,
  	GSHAREDVT_RET_IREGS = 2,
  	GSHAREDVT_RET_I1 = 3,
  	GSHAREDVT_RET_U1 = 4,
  	GSHAREDVT_RET_I2 = 5,
  	GSHAREDVT_RET_U2 = 6
  } GSharedVtRetMarshal;
  
  typedef struct {
  	/* Method address to call */
  	gpointer addr;
  	/* The trampoline reads this, so keep the size explicit */
  	int ret_marshal;
  	/* If ret_marshal != NONE, this is the reg of the vret arg, else -1 */
  	int vret_arg_reg;
  	/* The stack slot where the return value will be stored */
  	int vret_slot;
  	int stack_usage, map_count;
  	/* If not -1, then make a virtual call using this vtable offset */
  	int vcall_offset;
  	/* If 1, make an indirect call to the address in the rgctx reg */
  	int calli;
  	/* Whenever this is a in or an out call */
  	int gsharedvt_in;
  	/* Maps stack slots/registers in the caller to the stack slots/registers in the callee */
  	/* A negative value means a register, i.e. -1=r0, -2=r1 etc. */
  	int map [MONO_ZERO_LEN_ARRAY];
  } GSharedVtCallInfo;
  
  /* Structure used by the sequence points in AOTed code */
  typedef struct {
  	gpointer ss_trigger_page;
  	gpointer bp_trigger_page;
  	guint8* bp_addrs [MONO_ZERO_LEN_ARRAY];
  } SeqPointInfo;
  
  
  #define PARAM_REGS 4
  #define DYN_CALL_STACK_ARGS 10
  
  typedef struct {
  	mgreg_t regs [PARAM_REGS + DYN_CALL_STACK_ARGS];
  	mgreg_t res, res2;
  	guint8 *ret;
  } DynCallArgs;
  
  void arm_patch (guchar *code, const guchar *target);
  guint8* mono_arm_emit_load_imm (guint8 *code, int dreg, guint32 val);
  int mono_arm_is_rotated_imm8 (guint32 val, gint *rot_amount);
  
  void
  mono_arm_throw_exception_by_token (guint32 type_token, mgreg_t pc, mgreg_t sp, mgreg_t *int_regs, gdouble *fp_regs);
  
  gpointer
  mono_arm_start_gsharedvt_call (GSharedVtCallInfo *info, gpointer *caller, gpointer *callee, gpointer mrgctx_reg);
  
  typedef enum {
  	MONO_ARM_FPU_NONE = 0,
  	MONO_ARM_FPU_VFP = 1,
  	MONO_ARM_FPU_VFP_HARD = 2
  } MonoArmFPU;
  
  /* keep the size of the structure a multiple of 8 */
  struct MonoLMF {
  	/* 
  	 * If the second lowest bit is set to 1, then this is a MonoLMFExt structure, and
  	 * the other fields are not valid.
  	 */
  	gpointer    previous_lmf;
  	gpointer    lmf_addr;
  	/* This is only set in trampoline LMF frames */
  	MonoMethod *method;
  	mgreg_t    sp;
  	mgreg_t    ip;
  	mgreg_t    fp;
  	/* Currently only used in trampolines on armhf to hold d0-d15. We don't really
  	 * need to put d0-d7 in the LMF, but it simplifies the trampoline code.
  	 */
  	double     fregs [16];
  	/* all but sp and pc: matches the PUSH instruction layout in the trampolines
  	 * 0-4 should be considered undefined (execpt in the magic tramp)
  	 * sp is saved at IP.
  	 */
  	mgreg_t    iregs [14];
  };
  
  typedef struct MonoCompileArch {
  	gpointer seq_point_info_var, ss_trigger_page_var;
  	gpointer seq_point_read_var, seq_point_ss_method_var;
  	gpointer seq_point_bp_method_var;
  	gpointer vret_addr_loc;
  	gboolean omit_fp, omit_fp_computed;
  	gpointer cinfo;
  	gpointer *vfp_scratch_slots [2];
  	int atomic_tmp_offset;
  	guint8 *thunks;
  	int thunks_size;
  } MonoCompileArch;
  
  #define MONO_ARCH_EMULATE_FCONV_TO_I8 1
  #define MONO_ARCH_EMULATE_LCONV_TO_R8 1
  #define MONO_ARCH_EMULATE_LCONV_TO_R4 1
  #define MONO_ARCH_EMULATE_LCONV_TO_R8_UN 1
  #define MONO_ARCH_EMULATE_FREM 1
  #define MONO_ARCH_EMULATE_DIV 1
  #define MONO_ARCH_EMULATE_CONV_R8_UN 1
  #define MONO_ARCH_EMULATE_MUL_OVF 1
  
  #define ARM_FIRST_ARG_REG 0
  #define ARM_LAST_ARG_REG 3
  
  #define MONO_ARCH_USE_SIGACTION 1
  
  #if defined(__native_client__) || defined(HOST_WATCHOS)
  #undef MONO_ARCH_USE_SIGACTION
  #endif
  
  #define MONO_ARCH_NEED_DIV_CHECK 1
  
  #define MONO_ARCH_HAVE_GENERALIZED_IMT_THUNK 1
  
  #define MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES 1
  #define MONO_ARCH_HAVE_DECOMPOSE_LONG_OPTS 1
  
  #define MONO_ARCH_AOT_SUPPORTED 1
  #define MONO_ARCH_LLVM_SUPPORTED 1
  
  #define MONO_ARCH_GSHARED_SUPPORTED 1
  #define MONO_ARCH_DYN_CALL_SUPPORTED 1
  #define MONO_ARCH_DYN_CALL_PARAM_AREA (DYN_CALL_STACK_ARGS * sizeof (mgreg_t))
  
  #ifndef MONO_CROSS_COMPILE
  #define MONO_ARCH_SOFT_DEBUG_SUPPORTED 1
  #endif
  
  #define MONO_ARCH_HAVE_EXCEPTIONS_INIT 1
  #define MONO_ARCH_HAVE_GET_TRAMPOLINES 1
  #define MONO_ARCH_HAVE_CONTEXT_SET_INT_REG 1
  #define MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX 1
  #define MONO_ARCH_GC_MAPS_SUPPORTED 1
  #define MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK 1
  #define MONO_ARCH_HAVE_CONTEXT_SET_INT_REG 1
  #define MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD 1
  #define MONO_ARCH_HAVE_SETUP_RESUME_FROM_SIGNAL_HANDLER_CTX 1
  #define MONO_ARCH_GSHAREDVT_SUPPORTED 1
  #define MONO_ARCH_HAVE_GENERAL_RGCTX_LAZY_FETCH_TRAMPOLINE 1
  #define MONO_ARCH_HAVE_OPCODE_NEEDS_EMULATION 1
  #define MONO_ARCH_HAVE_OBJC_GET_SELECTOR 1
  #define MONO_ARCH_HAVE_OP_TAIL_CALL 1
  #define MONO_ARCH_HAVE_DUMMY_INIT 1
  #define MONO_ARCH_HAVE_SDB_TRAMPOLINES 1
  #define MONO_ARCH_HAVE_PATCH_CODE_NEW 1
  #define MONO_ARCH_HAVE_OP_GENERIC_CLASS_INIT 1
  
  #if defined(__native_client__)
  #undef MONO_ARCH_SOFT_DEBUG_SUPPORTED
  #undef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
  #undef MONO_ARCH_HAVE_CONTEXT_SET_INT_REG
  #endif
  
  #define MONO_ARCH_HAVE_TLS_GET (mono_arm_have_tls_get ())
  #define MONO_ARCH_HAVE_TLS_GET_REG 1
  
  /* ARM doesn't have too many registers, so we have to use a callee saved one */
  #define MONO_ARCH_RGCTX_REG ARMREG_V5
  #define MONO_ARCH_IMT_REG MONO_ARCH_RGCTX_REG
  /* First argument reg */
  #define MONO_ARCH_VTABLE_REG ARMREG_R0
  #define MONO_ARCH_EXC_REG ARMREG_R0
  
  #define MONO_CONTEXT_SET_LLVM_EXC_REG(ctx, exc) do { (ctx)->regs [0] = (gsize)exc; } while (0)
  
  #define MONO_INIT_CONTEXT_FROM_FUNC(ctx,func) do {	\
  		MONO_CONTEXT_SET_BP ((ctx), __builtin_frame_address (0));	\
  		MONO_CONTEXT_SET_SP ((ctx), __builtin_frame_address (0));	\
  		MONO_CONTEXT_SET_IP ((ctx), (func));	\
  	} while (0)
  
  #define MONO_ARCH_INIT_TOP_LMF_ENTRY(lmf)
  
  void
  mono_arm_throw_exception (MonoObject *exc, mgreg_t pc, mgreg_t sp, mgreg_t *int_regs, gdouble *fp_regs);
  
  void
  mono_arm_throw_exception_by_token (guint32 type_token, mgreg_t pc, mgreg_t sp, mgreg_t *int_regs, gdouble *fp_regs);
  
  void
  mono_arm_resume_unwind (guint32 dummy1, mgreg_t pc, mgreg_t sp, mgreg_t *int_regs, gdouble *fp_regs);
  
  gboolean
  mono_arm_thumb_supported (void);
  
  GSList*
  mono_arm_get_exception_trampolines (gboolean aot);
  
  guint8*
  mono_arm_get_thumb_plt_entry (guint8 *code);
  
  guint8*
  mono_arm_patchable_b (guint8 *code, int cond);
  
  guint8*
  mono_arm_patchable_bl (guint8 *code, int cond);
  
  #ifdef USE_JUMP_TABLES
  guint8*
  mono_arm_load_jumptable_entry_addr (guint8 *code, gpointer *jte, ARMReg reg);
  
  guint8*
  mono_arm_load_jumptable_entry (guint8 *code, gpointer *jte, ARMReg reg);
  #endif
  
  gboolean
  mono_arm_is_hard_float (void);
  
  gboolean
  mono_arm_have_tls_get (void);
  
  void
  mono_arm_unaligned_stack (MonoMethod *method);
  
  #endif /* __MONO_MINI_ARM_H__ */
  